Crossword Genius

Nigeria had ordered a sound investment (7,3)

Ross

I believe the answer is:

hearing aid

'a sound investment' is the definition.
(something helping someone to hear sound)

'nigeria had ordered' is the wordplay.
'ordered' indicates an anagram.
'nigeria'+'had'='nigeriahad'
'nigeriahad' is an anagram of 'HEARING-AID'.

(Other definitions for hearing aid that I've seen before include "Amplifier for ear" , "Ear trumpet" , "Help for the partially deaf" , "Earpiece" , "asset in court?" .)

I've seen this clue in The Guardian.
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